Spark plug



Jan.l 8, 1929. 1,698,580

l G. BURKE ET Al.

SPARK IPLUG Filed Nov.17.'1927 2 sheets-sneek 1 Figi. 6"

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2 Sheets-Sheet 2 F i El Jan. 8, 1929.

' G. BURKE ET AL SPARK PLUG Filed Nov. 1'7 1927 Patented Jan. 8, 1929. l

UNITED Stans are 1,698,580 orme.

SPARK PLUG.

Application led November 17, 1927. Sierial No. 233,914.

The present invention relates to a spark plug provided with cleaning means and also means for supplying fuelvto the electrodes and into the cylinder to facilitate starting of the engine. It is an object of the invention to provide? a perforation or a pluralityof perforations in the plug nut and the securing nut which is threaded in the plug nut. A still further object resides in the provision that when the securing nut is tightly secured in the plug nut the perforations will be out of register and therefore the passage will be closed but when the securing nut is given a slight turn, for instance, a V6 turn, the perforations will be in register and a cleaning,

priming or inspection of the engine and plug can take place. The securing nut is also provided with a circular channel into which priming fuel is placed and from which it flows into the perforations. A washer is also provided with the perforation as well as means for preventing rotation thereof. A still further object resides in the provision of the perforations so that they are approximately parallel to the longitudinal aXis of the plug.

Other objects will be apparent from the following description taken in connection with the accompanying drawings in which:

Figure 1 is av longitudinal section of the spark plug through the perforations, y

Fig. 2 is a top view of the securing nut, the insulators and the central electrode,

Fig. 3 is a side view of a portion of the spark plug showing the perforations in the nuts in open position,

- Fig. 4 is a side View of a portion of the spark plug showing the perforations inthe nuts in closed position and the securing nut in tightened position,

Fig. 5 is a longitudinal section of a modified construction of the perforations,

Fig. 6 is a top view of the gasket or tightening washer,

Fig. 7 is a perspective view of a modified form of spark plug showing the securing nut, and

Fig. 8 is a perspective view of a modified form of spark plug showing the plug nut for the nut of Fig. 7.

The spark plug comprises a plug nut 1 and a securing nut 2 between which a gasket or washer 3 is placed to secure a tight joint between them. In the bottom of the nut 1 is an electrode 4, and insulators 5 are secured around the central electrode 6. The usual binding nut 7 and washer 8 are placed at the top of the electrode 6 andthe other end of the kelectrode 6 cooperates with i electrode 4 to form the spark points for the spark. The plug nut has a screwthreaded end 38 by which the spark plug can be inserted in the engine.

The plug nut 1 is provided with suitable perforations 9, preferably two inr number,

arranged diametrically opposite and starting from the top surface 10 and extending to the inner portion of the nut at the point 11 just belowV the nut 2.V Corresponding perforations 12 are arranged in the washer Sand perforations 15 in the nut 2 so that, as shown in Figfl, a complete passage is provided from the outside to the inside of the plug. In, the upper face 13 of the nut 2, a circular channel 14 is provided in the bottom of which the perforations 15 terminate.

Figs. 3 and 4 clearly indicate the operation of the construction in which Fig. 4 shows the perforations closed and the securing nut tightly adjusted in the plug nut and the plug fully operative. If itis desired to clean t-he electrodes, prime the motor or determine if a cylinder is functioning properly the spark plug is not removed from the cylinder of the engine lbut the securing nut is given a 1/6 turn in the plug nut so that the perforations 15 will come in alignment with perforations 9 and 12. This will not only result in opening the closure but when the engine is running will also show the operation of the engine by the appearance of the red gases through the perforations, thereby self cleaning the plug or causing thev plug to operate if it has not previously operated. This will clean the spark points and if it is desired to prime the motor, fuel oil can be placed in the channel 14 from where it will run into and through the perforations and into the cylinders and on the electrodes, thus facilitating starting of the engine.

The washer 3 is preferably provided with two detents 16 which are adapted to fit into corresponding depressions 17 in the plug nut so that the washer will not rotate when the;

nut 2 is rotated. In this way the perforations 12 in the washer will always be in alignment with the perforations 9 in the nut 1.

Fig. 5 illustrates a modified form of construction in which the perforations 18' are provided directly between the two nuts through the threads thereof. The opening 19 in the inner part of the nut 1 is somewhat elongated but does not project below the intermediate portion of the plug nut.

' Figs. 7 and 8 show a modified construction in Whichthe perforations 21 in securing nut 2 projects through the screwthreaded portion 19 thereof and this portion seats on the surface 2O of the plug nut 1. In the nut 1, the perforations 22 project through the surface 20 and inner surface 23 which is slightly conical. The'operation of this construction is the same as in the other modifications. j

The perforations in the nuts are preferably placed at the corners of the hexagonal nuts as clearly indicated in Figs. 2, 7 and 8 and one of the sets of perforations is preferably placed directly above the elect-rode 4, as shown in Fig 1.

We claim as our invention: Y

1. A spark plug for an internal combustion engine comprising a plug nut adapted'to be inserted in the engine by a screwthreaded portion and having a perforation therein; and a securing nut adapted to be screwthread ed in the plug nut and having a perforation therein adapted to cooperate with said perforation inthe plug nut to permit communication therethrough into the engine, said perforation in the securing nut being so provided that when the securing nut is tightly secured in the plug nut the p'erforations will be out of alignmentv l 2. A spark plug for lan internal combustion engine comprising a plug nut adapted to be inserted in the engine by a screivthreaded pore tion and having two perforations therein and a securing nut adapted to be screivthreaded in the plug nut and having two perforations therein adapted to cooperate with said perforations inthe plug n ut to permit communication therethrough into the engine and having a circular channel in the top of the securing nut in which the perforations terminate in one end, said perforations in the 'securing' nut being so provided that When the securing nut is tightly secured in the plug nut the perforations in both nuts Will be out of alignment and said perforations in the nuts being arranged approXimately parallel to the longi tudinal axis of they plug.

In testimony whereof We .aftiXV oursignaw tures.

GUILLERMO BURKE. MANUEL ACOSTA.

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